#!/bin/sh
#
# Part of Gerrit Code Review (http://code.google.com/p/gerrit/)
#
# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

unset GREP_OPTIONS

CHANGE_ID_AFTER="Bug|Issue"
MSG="$1"

# Check for, and add if missing, a unique Change-Id
#
cat << END1 > ~/.gitmsg.bak
Module: modification summary

DTS/AR:
reason:

END1

add_ChangeId() {
        clean_message=`sed -e '
                /^diff --git .*/{
                        s///
                        q
                }
                /^Signed-off-by:/d
                /^#/d
        ' "$MSG" | git stripspace`
        if ! echo "$clean_message" | grep 'Merge' &> /dev/null; then
            echo "$clean_message" > ~/.gitmsg
            echo "" >> ~/.gitmsg
        fi
        if test -z "$clean_message"
        then
                return
        fi

        if test "false" = "`git config --bool --get gerrit.createChangeId`"
        then
                return
        fi

        # Does Change-Id: already exist? if so, exit (no change).
        if grep -i '^Change-Id:' "$MSG" >/dev/null
        then
                return
        fi

        id=`_gen_ChangeId`
        T="$MSG.tmp.$$"
        AWK=awk
        if [ -x /usr/xpg4/bin/awk ]; then
                # Solaris AWK is just too broken
                AWK=/usr/xpg4/bin/awk
        fi

        # How this works:
        # - parse the commit message as (textLine+ blankLine*)*
        # - assume textLine+ to be a footer until proven otherwise
        # - exception: the first block is not footer (as it is the title)
        # - read textLine+ into a variable
        # - then count blankLines
        # - once the next textLine appears, print textLine+ blankLine* as these
        #   aren't footer
        # - in END, the last textLine+ block is available for footer parsing
        $AWK '
        BEGIN {
                # while we start with the assumption that textLine+
                # is a footer, the first block is not.
                isFooter = 0
                footerComment = 0
                blankLines = 0
        }

        # Skip lines starting with "#" without any spaces before it.
        /^#/ { next }

        # Skip the line starting with the diff command and everything after it,
        # up to the end of the file, assuming it is only patch data.
        # If more than one line before the diff was empty, strip all but one.
        /^diff --git / {
                blankLines = 0
                while (getline) { }
                next
        }

        # Count blank lines outside footer comments
        /^$/ && (footerComment == 0) {
                blankLines++
                next
        }

        # Catch footer comment
        /^\[[a-zA-Z0-9-]+:/ && (isFooter == 1) {
                footerComment = 1
        }

        /]$/ && (footerComment == 1) {
                footerComment = 2
        }

        # We have a non-blank line after blank lines. Handle this.
        (blankLines > 0) {
                print lines
                for (i = 0; i < blankLines; i++) {
                        print ""
                }

                lines = ""
                blankLines = 0
                isFooter = 1
                footerComment = 0
        }

        # Detect that the current block is not the footer
        (footerComment == 0) && (!/^\[?[a-zA-Z0-9-]+:/ || /^[a-zA-Z0-9-]+:\/\//) {
                isFooter = 0
        }

        {
                # We need this information about the current last comment line
                if (footerComment == 2) {
                        footerComment = 0
                }
                if (lines != "") {
                        lines = lines "\n";
                }
                lines = lines $0
        }

        # Footer handling:
        # If the last block is considered a footer, splice in the Change-Id at the
        # right place.
        # Look for the right place to inject Change-Id by considering
        # CHANGE_ID_AFTER. Keys listed in it (case insensitive) come first,
        # then Change-Id, then everything else (eg. Signed-off-by:).
        #
        # Otherwise just print the last block, a new line and the Change-Id as a
        # block of its own.
        END {
                unprinted = 1
                if (isFooter == 0) {
                        print lines "\n"
                        lines = ""
                }
                changeIdAfter = "^(" tolower("'"$CHANGE_ID_AFTER"'") "):"
                numlines = split(lines, footer, "\n")
                for (line = 1; line <= numlines; line++) {
                        if (unprinted && match(tolower(footer[line]), changeIdAfter) != 1) {
                                unprinted = 0
                                print "Change-Id: I'"$id"'"
                        }
                        print footer[line]
                }
                if (unprinted) {
                        print "Change-Id: I'"$id"'"
                }
        }' "$MSG" > "$T" && mv "$T" "$MSG" || rm -f "$T"
}
_gen_ChangeIdInput() {
        echo "tree `git write-tree`"
        if parent=`git rev-parse "HEAD^0" 2>/dev/null`
        then
                echo "parent $parent"
        fi
        echo "author `git var GIT_AUTHOR_IDENT`"
        echo "committer `git var GIT_COMMITTER_IDENT`"
        echo
        printf '%s' "$clean_message"
}
_gen_ChangeId() {
        _gen_ChangeIdInput |
        git hash-object -t commit --stdin
}

add_filelist()
{
    files=''
    repo_dir=`git config -l | grep 'remote.origin.projectname' | awk -F "=" '{print $2}'`
    tmp_file_1=`mktemp`
    tmp_file_2=`mktemp`
    git status > ${tmp_file_1}
    cat ${tmp_file_1} | sed -n '/# Changes to be committed/,/# [A-Za-z]/{//!p}' > ${tmp_file_2}
    grep '#     modified:' ${tmp_file_2} > ${tmp_file_1}
    while read line
    do
        file_tmp=${line#*modified:}
        file_tmp=`echo "$file_tmp" | awk '{gsub(/ /,"")}1'`
        files="$files $repo_dir/$file_tmp"
    done < ${tmp_file_1}
    rm -f ${tmp_file_1} ${tmp_file_2}
    sed -i -e "/\[Author\]/a\[Filelist\]: $files" "$MSG"
}


add_ChangeId
#add_filelist
echo_errorinfo()
{
    echo "ERROR:commit message doesn't match standard format,please check!"
    echo "======standard format ========="
    echo "Module: modification summary"
    echo ""
    echo "commit_type:bugfix/CVE/req/other"
    echo "commit_detail:..."
    echo "reason:..."
    echo "Signed-off-by: ...#git commit –s will automatic add this"
    echo "============================"
    echo "$1"
    exit 1
}

# line_num=0
#check summary
module_line=`cat "$MSG" | head -n 1`
if ! echo ${module_line} | grep '.*:.*'>/dev/null; then
    echo_errorinfo "some error on module: change summary"
fi
module_name=`echo ${module_line} | awk -F ':' '{print $1}'`
change_summary=`echo ${module_line} | awk -F ':' '{print $2}'`
if [ "$module_name" == "Module" ]; then
    echo_errorinfo "Summary error, please change the part before ':', you shoudn't just use the template"
fi
if echo ${change_summary} | grep "modification summary"; then
    echo_errorinfo "Summary error, Please change the part after ':', you shoudn't just use the template"
fi

#need space line before DTS/AR:
sed -n 2p  $1 |grep "^[[:space:]]*$" >/dev/null
if [ $? -ne 0 ];then
   echo_errorinfo "There must have a space line at the second line"
fi

#check ticket status
commit_type=$(sed -n 3p $1 | cut -d ":" -f 2 | tr " " "\n")
if [ "${commit_type}"x = "bugfix"x -o "${commit_type}"x = "CVE"x -o "${commit_type}"x = "req"x -o "${commit_type}"x = "other"x ]; then
    continue
else
    echo_errorinfo " some error on commit_type:bugfix/CVE/req/other "
fi
commit_detail=$(sed -n 4p $1 | cut -d ":" -f 2 | tr " " "\n")
if [ "${commit_type}"x = "CVE"x ]; then
    if ! echo ${commit_detail} | grep "^CVE--*--*"; then
        echo_errorinfo "missing CVE"
    fi
fi
for line in `sed -n 4p $1 | cut -d ":" -f 2 | tr " " "\n" `
do
    if ! echo ${line} | grep "^[[:space:]]*DTS20[0-9]\{11\}[[:space:]]*$" >/dev/null ;then
        if ! echo ${line} | egrep "^[[:space:]]*AR*|^[[:space:]]*SR*" >/dev/null;then
            if ! echo ${line} | grep "^[[:space:]]*S[1-9][0-9]" >/dev/null;then
                echo_errorinfo "some error on DTS/AR: DTS[0-9]{13}$/S[1-9][0-9]$/AR*"
            fi
        fi
    fi
done


#check log
if ! sed -n 5p $1 | egrep 'reason:.*\w+'>/dev/null;then
    echo_errorinfo "some error on reason:.*\w+"
fi
cp -a ~/.gitmsg.bak ~/.gitmsg
